build: drop autotools support

There is no point in supporting two different build systems.

10 files changed, 0 insertions, 445 deletions

diff --git a/m4/.gitignore b/m4/.gitignore
deleted file mode 100644
index c78f8072..00000000
--- a/m4/.gitignore
+++ /dev/null
@@ -1,10 +0,0 @@
-*.m4
-!attribute.m4
-!jh_path_xml_catalog.m4
-!ld-as-needed.m4
-!ld-no-undefined.m4
-!ld-z-now.m4
-!ld-O1.m4
-!libprelude.m4
-!warnings.m4
-!warn_lang_flags.m4
diff --git a/m4/attribute.m4 b/m4/attribute.m4
deleted file mode 100644
index 3aa2e5fc..00000000
--- a/m4/attribute.m4
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/usr/bin/m4
-dnl Check for compiler attributes
-
-AC_DEFUN([PAM_ATTRIBUTE_UNUSED], [
-  AC_CACHE_CHECK([for __attribute__((unused))], [pam_cv_attribute_unused],
-    [AC_COMPILE_IFELSE(
-      [AC_LANG_PROGRAM([[int fun(int i __attribute__((unused)));]],
-                       [[return fun(0);]])],
-      [pam_cv_attribute_unused=yes],
-      [pam_cv_attribute_unused=no])])
-  AS_IF([test "$pam_cv_attribute_unused" = yes],
-        [unused='__attribute__((unused))'],
-        [unused=])
-  AC_DEFINE_UNQUOTED([UNUSED], [$unused],
-                     [Define if the compiler supports __attribute__((unused))])
-])
diff --git a/m4/jh_path_xml_catalog.m4 b/m4/jh_path_xml_catalog.m4
deleted file mode 100644
index 1f2eff3a..00000000
--- a/m4/jh_path_xml_catalog.m4
+++ /dev/null
@@ -1,54 +0,0 @@
-# Checks the location of the XML Catalog
-# Usage:
-#   JH_PATH_XML_CATALOG([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-# Defines XMLCATALOG and XML_CATALOG_FILE substitutions
-AC_DEFUN([JH_PATH_XML_CATALOG],
-[
-  # check for the presence of the XML catalog
-  AC_ARG_WITH([xml-catalog],
-              [AS_HELP_STRING([--with-xml-catalog=CATALOG],
-                             [path to xml catalog to use])],,
-              [with_xml_catalog=/etc/xml/catalog])
-  jh_found_xmlcatalog=true
-  XML_CATALOG_FILE="$with_xml_catalog"
-  AC_SUBST([XML_CATALOG_FILE])
-  AC_MSG_CHECKING([for XML catalog ($XML_CATALOG_FILE)])
-  if test -f "$XML_CATALOG_FILE"; then
-    AC_MSG_RESULT([found])
-  else
-    jh_found_xmlcatalog=false
-    AC_MSG_RESULT([not found])
-  fi
-
-  # check for the xmlcatalog program
-  AC_PATH_PROG(XMLCATALOG, xmlcatalog, no)
-  if test "x$XMLCATALOG" = xno; then
-    jh_found_xmlcatalog=false
-  fi
-
-  if $jh_found_xmlcatalog; then
-    ifelse([$1],,[:],[$1])
-  else
-    ifelse([$2],,[AC_MSG_ERROR([could not find XML catalog])],[$2])
-  fi
-])
-
-# Checks if a particular URI appears in the XML catalog
-# Usage:
-#   JH_CHECK_XML_CATALOG(URI, [FRIENDLY-NAME], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-AC_DEFUN([JH_CHECK_XML_CATALOG],
-[
-  AC_REQUIRE([JH_PATH_XML_CATALOG],[JH_PATH_XML_CATALOG(,[:])])dnl
-  AC_MSG_CHECKING([for ifelse([$2],,[$1],[$2]) in XML catalog])
-  if $jh_found_xmlcatalog && \
-     AC_RUN_LOG([$XMLCATALOG --noout "$XML_CATALOG_FILE" "$1" >&2]); then
-    AC_MSG_RESULT([found])
-    ifelse([$3],,,[$3
-])dnl
-  else
-    AC_MSG_RESULT([not found])
-    ifelse([$4],,
-       [AC_MSG_ERROR([could not find ifelse([$2],,[$1],[$2]) in XML catalog])],
-       [$4])
-  fi
-])
diff --git a/m4/ld-O1.m4 b/m4/ld-O1.m4
deleted file mode 100644
index 64593280..00000000
--- a/m4/ld-O1.m4
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/usr/bin/m4
-dnl Check whether ld supports -O1
-
-AC_DEFUN([PAM_LD_O1], [dnl
-  AC_CACHE_CHECK([whether ld supports -O1],
-                 [pam_cv_ld_O1],
-                 [saved_LDFLAGS="$LDFLAGS"
-                  LDFLAGS="$LDFLAGS -Wl,-O1"
-                  AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
-                                 [pam_cv_ld_O1=yes],
-                                 [pam_cv_ld_O1=no])
-                  LDFLAGS="$saved_LDFLAGS"])
-  AS_IF([test $pam_cv_ld_O1 = yes],
-        [LDFLAGS="$LDFLAGS -Wl,-O1"])
-])
diff --git a/m4/ld-as-needed.m4 b/m4/ld-as-needed.m4
deleted file mode 100644
index d6590192..00000000
--- a/m4/ld-as-needed.m4
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/usr/bin/m4
-dnl Check whether ld supports --as-needed
-
-AC_DEFUN([PAM_LD_AS_NEEDED], [dnl
-  AC_CACHE_CHECK([whether ld supports --as-needed],
-                 [pam_cv_ld_as_needed],
-                 [saved_LDFLAGS="$LDFLAGS"
-                  LDFLAGS="$LDFLAGS -Wl,--as-needed"
-                  AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
-                                 [pam_cv_ld_as_needed=yes],
-                                 [pam_cv_ld_as_needed=no])
-                  LDFLAGS="$saved_LDFLAGS"])
-  AS_IF([test $pam_cv_ld_as_needed = yes],
-        [LDFLAGS="$LDFLAGS -Wl,--as-needed"])
-])
diff --git a/m4/ld-no-undefined.m4 b/m4/ld-no-undefined.m4
deleted file mode 100644
index 6f342d00..00000000
--- a/m4/ld-no-undefined.m4
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/usr/bin/m4
-dnl Check whether ld supports --no-undefined
-
-AC_DEFUN([PAM_LD_NO_UNDEFINED], [dnl
-  AC_CACHE_CHECK([whether ld supports --no-undefined],
-                 [pam_cv_ld_no_undefined],
-                 [saved_LDFLAGS="$LDFLAGS"
-                  LDFLAGS="$LDFLAGS -Wl,--no-undefined"
-                  AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
-                                 [pam_cv_ld_no_undefined=yes],
-                                 [pam_cv_ld_no_undefined=no])
-                  LDFLAGS="$saved_LDFLAGS"])
-  AS_IF([test $pam_cv_ld_no_undefined = yes],
-        [LDFLAGS="$LDFLAGS -Wl,--no-undefined"])
-])
diff --git a/m4/ld-z-now.m4 b/m4/ld-z-now.m4
deleted file mode 100644
index 1bc82594..00000000
--- a/m4/ld-z-now.m4
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/usr/bin/m4
-dnl Check whether ld supports "-z now"
-
-AC_DEFUN([PAM_LD_Z_NOW], [dnl
-  AC_CACHE_CHECK([whether ld supports "-z now"],
-                 [pam_cv_ld_z_now],
-                 [saved_LDFLAGS="$LDFLAGS"
-                  LDFLAGS="$LDFLAGS -Wl,-z,now"
-                  AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
-                                 [pam_cv_ld_z_now=yes],
-                                 [pam_cv_ld_z_now=no])
-                  LDFLAGS="$saved_LDFLAGS"])
-  AS_IF([test $pam_cv_ld_z_now = yes],
-        [ZNOW_LDFLAGS="-Wl,-z,now"],
-        [ZNOW_LDFLAGS=])
-])
diff --git a/m4/libprelude.m4 b/m4/libprelude.m4
deleted file mode 100644
index d6a1efd9..00000000
--- a/m4/libprelude.m4
+++ /dev/null
@@ -1,181 +0,0 @@
-dnl Autoconf macros for libprelude
-dnl $id$
-
-# Modified for LIBPRELUDE -- Yoann Vandoorselaere
-# Modified for LIBGNUTLS -- nmav
-# Configure paths for LIBGCRYPT
-# Shamelessly stolen from the one of XDELTA by Owen Taylor
-# Werner Koch   99-12-09
-
-dnl AM_PATH_LIBPRELUDE([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
-dnl Test for libprelude, and define LIBPRELUDE_PREFIX, LIBPRELUDE_CFLAGS, LIBPRELUDE_PTHREAD_CFLAGS,
-dnl LIBPRELUDE_LDFLAGS, and LIBPRELUDE_LIBS
-dnl
-AC_DEFUN([AM_PATH_LIBPRELUDE],
-[dnl
-dnl Get the cflags and libraries from the libprelude-config script
-dnl
-AC_ARG_WITH(libprelude-prefix, [AS_HELP_STRING([--with-libprelude-prefix=PFX],
-            [Prefix where libprelude is installed (optional)])],
-            libprelude_config_prefix="$withval", libprelude_config_prefix="")
-
-  if test x$libprelude_config_prefix != x ; then
-     if test x${LIBPRELUDE_CONFIG+set} != xset ; then
-        LIBPRELUDE_CONFIG=$libprelude_config_prefix/bin/libprelude-config
-     fi
-  fi
-
-  AC_PATH_PROG(LIBPRELUDE_CONFIG, libprelude-config, no)
-  min_libprelude_version=ifelse([$1], ,0.1.0,$1)
-  AC_MSG_CHECKING(for libprelude - version >= $min_libprelude_version)
-  no_libprelude=""
-  if test "$LIBPRELUDE_CONFIG" = "no" ; then
-    no_libprelude=yes
-  else
-    LIBPRELUDE_CFLAGS=`$LIBPRELUDE_CONFIG $libprelude_config_args --cflags`
-    LIBPRELUDE_PTHREAD_CFLAGS=`$LIBPRELUDE_CONFIG $libprelude_config_args --pthread-cflags`
-    LIBPRELUDE_LDFLAGS=`$LIBPRELUDE_CONFIG $libprelude_config_args --ldflags`
-    LIBPRELUDE_LIBS=`$LIBPRELUDE_CONFIG $libprelude_config_args --libs`
-    LIBPRELUDE_PREFIX=`$LIBPRELUDE_CONFIG $libprelude_config_args --prefix`
-    LIBPRELUDE_CONFIG_PREFIX=`$LIBPRELUDE_CONFIG $libprelude_config_args --config-prefix`
-    libprelude_config_version=`$LIBPRELUDE_CONFIG $libprelude_config_args --version`
-
-
-      ac_save_CFLAGS="$CFLAGS"
-      ac_save_LDFLAGS="$LDFLAGS"
-      ac_save_LIBS="$LIBS"
-      CFLAGS="$CFLAGS $LIBPRELUDE_CFLAGS"
-      LDFLAGS="$LDFLAGS $LIBPRELUDE_LDFLAGS"
-      LIBS="$LIBS $LIBPRELUDE_LIBS"
-dnl
-dnl Now check if the installed libprelude is sufficiently new. Also sanity
-dnl checks the results of libprelude-config to some extent
-dnl
-      rm -f conf.libpreludetest
-      AC_RUN_IFELSE([
-      AC_LANG_SOURCE([[
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <libprelude/prelude.h>
-
-int
-main ()
-{
-    system ("touch conf.libpreludetest");
-
-    if( strcmp( prelude_check_version(NULL), "$libprelude_config_version" ) )
-    {
-      printf("\n*** 'libprelude-config --version' returned %s, but LIBPRELUDE (%s)\n",
-             "$libprelude_config_version", prelude_check_version(NULL) );
-      printf("*** was found! If libprelude-config was correct, then it is best\n");
-      printf("*** to remove the old version of LIBPRELUDE. You may also be able to fix the error\n");
-      printf("*** by modifying your LD_LIBRARY_PATH environment variable, or by editing\n");
-      printf("*** /etc/ld.so.conf. Make sure you have run ldconfig if that is\n");
-      printf("*** required on your system.\n");
-      printf("*** If libprelude-config was wrong, set the environment variable LIBPRELUDE_CONFIG\n");
-      printf("*** to point to the correct copy of libprelude-config, and remove the file config.cache\n");
-      printf("*** before re-running configure\n");
-    }
-    else if ( strcmp(prelude_check_version(NULL), LIBPRELUDE_VERSION ) )
-    {
-      printf("\n*** LIBPRELUDE header file (version %s) does not match\n", LIBPRELUDE_VERSION);
-      printf("*** library (version %s)\n", prelude_check_version(NULL) );
-    }
-    else
-    {
-      if ( prelude_check_version( "$min_libprelude_version" ) )
-      {
-        return 0;
-      }
-     else
-      {
-        printf("no\n*** An old version of LIBPRELUDE (%s) was found.\n",
-                prelude_check_version(NULL) );
-        printf("*** You need a version of LIBPRELUDE newer than %s. The latest version of\n",
-               "$min_libprelude_version" );
-        printf("*** LIBPRELUDE is always available from http://www.prelude-ids.org/download/releases.\n");
-        printf("*** \n");
-        printf("*** If you have already installed a sufficiently new version, this error\n");
-        printf("*** probably means that the wrong copy of the libprelude-config shell script is\n");
-        printf("*** being found. The easiest way to fix this is to remove the old version\n");
-        printf("*** of LIBPRELUDE, but you can also set the LIBPRELUDE_CONFIG environment to point to the\n");
-        printf("*** correct copy of libprelude-config. (In this case, you will have to\n");
-        printf("*** modify your LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf\n");
-        printf("*** so that the correct libraries are found at run-time))\n");
-      }
-    }
-  return 1;
-}
-]])],[],[no_libprelude=yes],[echo $ac_n "cross compiling; assumed OK... $ac_c"])
-       CFLAGS="$ac_save_CFLAGS"
-       LIBS="$ac_save_LIBS"
-       LDFLAGS="$ac_save_LDFLAGS"
-  fi
-
-  if test "x$no_libprelude" = x ; then
-     AC_MSG_RESULT(yes)
-     ifelse([$2], , :, [$2])
-  else
-     if test -f conf.libpreludetest ; then
-        :
-     else
-        AC_MSG_RESULT(no)
-     fi
-     if test "$LIBPRELUDE_CONFIG" = "no" ; then
-       if test x$libprelude_config_prefix != x ; then
-         echo "*** The libprelude-config script installed by LIBPRELUDE could not be found"
-         echo "*** If LIBPRELUDE was installed in PREFIX, make sure PREFIX/bin is in"
-         echo "*** your path, or set the LIBPRELUDE_CONFIG environment variable to the"
-         echo "*** full path to libprelude-config."
-       fi
-     else
-       if test -f conf.libpreludetest ; then
-        :
-       else
-          echo "*** Could not run libprelude test program, checking why..."
-          CFLAGS="$CFLAGS $LIBPRELUDE_CFLAGS"
-          LDFLAGS="$LDFLAGS $LIBPRELUDE_LDFLAGS"
-          LIBS="$LIBS $LIBPRELUDE_LIBS"
-          AC_LINK_IFELSE([
-          AC_LANG_PROGRAM([[
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <libprelude/prelude.h>
-]],
-        [[ return !!prelude_check_version(NULL); ]])],
-        [ echo "*** The test program compiled, but did not run. This usually means"
-          echo "*** that the run-time linker is not finding LIBPRELUDE or finding the wrong"
-          echo "*** version of LIBPRELUDE. If it is not finding LIBPRELUDE, you'll need to set your"
-          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
-          echo "*** to the installed location  Also, make sure you have run ldconfig if that"
-          echo "*** is required on your system"
-          echo "***"
-          echo "*** If you have an old version installed, it is best to remove it, although"
-          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"
-          echo "***" ],
-        [ echo "*** The test program failed to compile or link. See the file config.log for the"
-          echo "*** exact error that occurred. This usually means LIBPRELUDE was incorrectly installed"
-          echo "*** or that you have moved LIBPRELUDE since it was installed. In the latter case, you"
-          echo "*** may want to edit the libprelude-config script: $LIBPRELUDE_CONFIG" ])
-          CFLAGS="$ac_save_CFLAGS"
-          LDFLAGS="$ac_save_LDFLAGS"
-          LIBS="$ac_save_LIBS"
-       fi
-     fi
-     LIBPRELUDE_CFLAGS=""
-     LIBPRELUDE_LDFLAGS=""
-     LIBPRELUDE_LIBS=""
-     ifelse([$3], , :, [$3])
-  fi
-  rm -f conf.libpreludetest
-  AC_SUBST(LIBPRELUDE_CFLAGS)
-  AC_SUBST(LIBPRELUDE_PTHREAD_CFLAGS)
-  AC_SUBST(LIBPRELUDE_LDFLAGS)
-  AC_SUBST(LIBPRELUDE_LIBS)
-  AC_SUBST(LIBPRELUDE_PREFIX)
-  AC_SUBST(LIBPRELUDE_CONFIG_PREFIX)
-])
-
-dnl *-*wedit:notab*-*  Please keep this as the last line.
diff --git a/m4/warn_lang_flags.m4 b/m4/warn_lang_flags.m4
deleted file mode 100644
index a4d6022f..00000000
--- a/m4/warn_lang_flags.m4
+++ /dev/null
@@ -1,38 +0,0 @@
-#!/usr/bin/m4
-
-AC_DEFUN([pam_WARN_LANG_FLAGS], [dnl
-gl_WARN_ADD([-W])
-gl_WARN_ADD([-Wall])
-gl_WARN_ADD([-Wbad-function-cast])
-gl_WARN_ADD([-Wcast-align])
-gl_WARN_ADD([-Wcast-align=strict])
-gl_WARN_ADD([-Wcast-qual])
-gl_WARN_ADD([-Wdeprecated])
-gl_WARN_ADD([-Wformat=2])
-gl_WARN_ADD([-Winit-self])
-gl_WARN_ADD([-Winline])
-gl_WARN_ADD([-Wmain])
-gl_WARN_ADD([-Wmissing-declarations])
-gl_WARN_ADD([-Wmissing-format-attribute])
-gl_WARN_ADD([-Wmissing-prototypes])
-gl_WARN_ADD([-Wnull-dereference])
-gl_WARN_ADD([-Wp64])
-gl_WARN_ADD([-Wpointer-arith])
-gl_WARN_ADD([-Wreturn-type])
-gl_WARN_ADD([-Wshadow])
-gl_WARN_ADD([-Wstrict-prototypes])
-gl_WARN_ADD([-Wundef])
-gl_WARN_ADD([-Wuninitialized])
-gl_WARN_ADD([-Wunused])
-gl_WARN_ADD([-Wwrite-strings])
-AC_ARG_ENABLE([Werror],
-  [AS_HELP_STRING([--enable-Werror], [turn on -Werror compiler option])],
-  [case $enableval in
-     yes) gl_WARN_ADD([-Werror]) ;;
-     no)  ;;
-     *)   AC_MSG_ERROR([bad value $enableval for Werror option]) ;;
-   esac])
-AS_VAR_PUSHDEF([pam_WARN_FLAGS], [WARN_[]_AC_LANG_PREFIX[]FLAGS])dnl
-AC_SUBST(pam_WARN_FLAGS)
-AS_VAR_POPDEF([pam_WARN_FLAGS])dnl
-])
diff --git a/m4/warnings.m4 b/m4/warnings.m4
deleted file mode 100644
index 628627d0..00000000
--- a/m4/warnings.m4
+++ /dev/null
@@ -1,85 +0,0 @@
-# warnings.m4 serial 11
-# modified for strace project
-dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-dnl From Simon Josefsson
-
-# gl_AS_VAR_APPEND(VAR, VALUE)
-# ----------------------------
-# Provide the functionality of AS_VAR_APPEND if Autoconf does not have it.
-m4_ifdef([AS_VAR_APPEND],
-[m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])],
-[m4_define([gl_AS_VAR_APPEND],
-[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
-
-
-# gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED],
-#                       [PROGRAM = AC_LANG_PROGRAM()])
-# -----------------------------------------------------------------
-# Check if the compiler supports OPTION when compiling PROGRAM.
-#
-# FIXME: gl_Warn must be used unquoted until we can assume Autoconf
-# 2.64 or newer.
-AC_DEFUN([gl_COMPILER_OPTION_IF],
-[AS_VAR_PUSHDEF([gl_Flags], _AC_LANG_PREFIX[]FLAGS)dnl
-AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]gl_Flags[]_$1])dnl
-AS_LITERAL_IF([$1],
-  [m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))],
-  [gl_positive="$1"
-case $gl_positive in
-  -Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;;
-esac
-m4_pushdef([gl_Positive], [$gl_positive])])dnl
-AC_CACHE_CHECK([whether $[]_AC_CC[] handles $1], m4_defn([gl_Warn]), [
-  gl_save_compiler_FLAGS="$gl_Flags"
-  gl_AS_VAR_APPEND(m4_defn([gl_Flags]),
-    [" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["])
-  AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
-                 [AS_VAR_SET(gl_Warn, [yes])],
-                 [AS_VAR_SET(gl_Warn, [no])])
-  gl_Flags="$gl_save_compiler_FLAGS"
-])
-AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
-m4_popdef([gl_Positive])dnl
-AS_VAR_POPDEF([gl_Flags])dnl
-AS_VAR_POPDEF([gl_Warn])dnl
-])
-
-# gl_UNKNOWN_WARNINGS_ARE_ERRORS
-# ------------------------------
-# Clang doesn't complain about unknown warning options unless one also
-# specifies -Wunknown-warning-option -Werror.  Detect this.
-AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS],
-[AS_IF([test x${gl_unknown_warnings_are_errors+set} = x],
-  [gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option],
-    [gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'],
-    [gl_unknown_warnings_are_errors=])
-  ])
-])
-
-# gl_WARN_ADD(OPTION, [VARIABLE = WARN_[]_AC_LANG_PREFIX[]FLAGS],
-#             [PROGRAM = AC_LANG_PROGRAM()])
-# ---------------------------------------------
-# Adds parameter to WARN_[]_AC_LANG_PREFIX[]FLAGS if the compiler supports it
-# when compiling PROGRAM.  For example, gl_WARN_ADD([-Wparentheses]).
-#
-# If VARIABLE is a variable name, AC_SUBST it.
-AC_DEFUN([gl_WARN_ADD],
-[AS_VAR_PUSHDEF([gl_WARN_FLAGS], [WARN_[]_AC_LANG_PREFIX[]FLAGS])dnl
-gl_UNKNOWN_WARNINGS_ARE_ERRORS
-gl_COMPILER_OPTION_IF([$1],
-  [gl_AS_VAR_APPEND(m4_if([$2], [], [gl_WARN_FLAGS], [[$2]]), [" $1"])],
-  [],
-  [$3])
-m4_ifval([$2],
-         [AS_LITERAL_IF([$2], [AC_SUBST([$2])])],
-         [AC_SUBST(gl_WARN_FLAGS)])dnl
-AS_VAR_POPDEF([gl_WARN_FLAGS])dnl
-])
-
-# Local Variables:
-# mode: autoconf
-# End: